Rolling mill



May 9, 1933. P. G. PALMGREN 1,908,263

- ROLLING MILL I FiledAug. 19, 1931 2 Sheets-Sheet 1 .INVENTOR AFR Gum/VAR PAL/WGREN std/14v M ATTORNEY May 9, 1933. P. G..PALMGREN 1,

ROLLING MILL Filed Aug. 19, 1951 2 Sheets-Sheet 2 INVENTOR PER GUN/VAR PALM/GWEN M ATTORNEY Patented May 9, 1933 UNITED STATES PATENT OFFICE 1 PER GUNNAR PAIMGREN, OEGOTTENBORG, SWEDEN, ASSIGNOB TO AKTIEBOLAGEI SVEN SKA OF GOTTENIBORG, SWEDEN, A CORPORATION 01' SWEDEN ROLLING 11111.1.

Application filed August 19, 1931. Serial No. 558,613.

ing the roll necks 1415 and 16-17 are The present invention relates to rolling mills of the type in which the pressure on the rolls is transmitted to and taken up by rings surrounding the roll'necks instead of by bearings in the usual manner. Rolhng mills of this type have the advantage over rollin'g mills of the ordinary type that the bearings and stands are only requlred to withstand comparatively small radlal loads and can therefore be dimensioned according- The use of rolling mills of this type has been connected with certain drawbacks. It is thus necessary to withdraw them endwlse from the surrounding rings. This has been attended by considerable difliculties. The removal of the lower roll allows the upper roll to drop since the bearings ofthe upper roll are slidable in the stands. Further, since the rings surround the roll necks and are supported by the rolls, they have been found to greatly impede the changing of rolls. A

The present invention has for its object to provide means for suspending the upper roll when changing the lower roll and also means for supporting the rings, when changing any of the rolls.

One embodiment of the invention is illustrated in the accompanying drawings, in which Figure 1 shows a side elevation partly 1n section of the rolling mill of the type to which the invention relates, and

Fig. 2 shows an end elevation of such mlll partly in section.

The material is rolled between the rolls 1 and 2. The intermediate roll 1, in the preferred form, is carried in bearings mounted in housings 3 and 4 suspended from the stand 5 by means of the yoke 6. The yoke can be vertically adjusted by turning the screw 7. The lower roll 2 is carried in bearings mounted in housings 8 and 9 which are held in axial position by means of aplate 10. The upper roll 11 is in a similar manner carried in bearings mounted in housings 12 and 13 vertically slidable in the .stand 5' and held in place by the plate 10. Surroundrings. 18 and 19. I

When the material is introduced between the rolls 1 and 2 the rolling pressure is transmitted to these rings, the bearings in the housings 8, 9, 12 and 13 being only required to take up the comparatively small horizontal component of the rolling pressure and any thrust that may arise in the roll system. In the embodiment according to the illustration all the rolls are shown as intended to be positively driven, although when roller bearings are used this is not necessary, it being suflicient to drive only one of the rolls.

When it is desired to change one of the lower rolls, as for instance roll 1 or 2, the upper roll-is suspended from the stand in the following manner. The bearing housings 12 and 13 are provided with projections 20 and 21. On the stand 5 are lugs 22 and 23 through which freely pm threaded bars 24 and 25. At the ends of the bars 24 and 25 are formed or attached eyes 26 and 27 adapted to be hooked over the projections 20 and 21. Wing nuts 280 and 290 are shown screwed on to the bars 24 and 25 and adapted to be tightened against the lugs 22 and 23. In this man- I is necessary to support the rings 18 and 19 and it is preferable to suspend them from the stand. For this purpose the gripping device illustrated may conveniently be used, which consists of two claw members 28 and 29 pivoted at 30 and 31 to a member 32 in a recess 33 in the stand. The claws 28 and 29 are at their upper ends provided with slots 34in which a projection 35 on a bar 36 is slidably movable. The bar 36 is threaded at its upper end and may be raised or lowered by turning the nut 37. The gripping device is shown in the open or lower position to the left in Fig. 1. To the right in the same figure the gripping device is shown in the closed or upper position which it is caused to assume when it is desired to suspend the ring 19. By screwing the nut 37 the bar 36 is raised and the projection 35 slides along the slots 34 ther thereby raising the bar 36 and the claw members 28 and 29 and thus lifting the member 32 in the recess 33 andalso raising .the ring 19 freeing the roll 11 and enabling it to be removed endwise.

In order to steady the rings when raised by the gripping device a pair of blocks 39 and 40 are provided for each ring. These blocks are drawn together, or separated, when required by means of a bar 41 having right and left screw threads. These blocks, upon being drawn together and adjacent the ring, chuck it. These blocks may, if desired, be used tosupport or raise the rings, either independently or cooperatively with the suspending device.

It will be understood that changes may be made within the scope of the claims without departing from the spirit of my invention.

Having thus described my invention, what I claim and desire to secure by Letters Patent is:

' 1. In a rolling mill having a frame, an upper roll, a lower roll and an intermediate roll disposed one above the other, bearing housings for the respective ends of the rolls, pressure transmitting rings mounted between the bearing housings surrounding the rolls inwardly thereof, each ring at its inner periph-' ery bearing against a plurality of rollers, means engaging the housings of the upper roll for suspending the upper roll and means for engaging and supporting the rings.

2. In a rolling mill having rolls provided at their ends with roll necks and a pressure receiving ring surrounding the set of roll' necks at each end and bearing with its inner periphery against a plurality of roll necks, of means disposed substantially symmetrically with reference to the vertical plane thru the axis of the rolls for sustaining the rings independently of the rolls for freeing the rolls to permit of their removal endwise through one of the pressure receiving rings.

3. In a rolling mill having a frame, an upper roll, a lower roll and an intermediate day of August, 1931.

PER GUNNAR PALMGREN.

roll disposed one above the other, bearing housings for the respective ends of the rolls, pressure transmitting rings mounted between the bearing housings surrounding the rolls inwardly thereof, 'each ring at its inner periphery bearing against a plurality of rolls, means free of the lower rolls for engagin and suspending the upper roll assembly an 

